The steel on this holder is thin metal. 30 ft. lbs., per instructions. I did this and the metal plate flexed so much it wrapped around the Trailer bumper wrapped and the lock washers didn't work properly.I only suggest you tighten it until there is no play.in the bumper bracket.I ended up not mounting my tire on these but used some of the parts that mine old one (which has a better construction) did not have.
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